optional
A credit for the data source, which is displayed on the canvas.

minimumLevel

Number

0

optional
The minimum level-of-detail supported by the imagery provider. Take care when specifying
this that the number of tiles at the minimum level is small, such as four or less. A larger number is likely
to result in rendering problems.

maximumLevel

Number

optional
The maximum level-of-detail supported by the imagery provider, or undefined if there is no limit.